Corpselight

This spell causes a dead or undead body to glow with a pale radiance. The glow may be white, yellow, green, amber, or red according to the desire of the caster. The caster can alter the glow at will if within close range of the glowing body. The light may vary from the barest outline to the brightness of a torch, suitable for reading or detailed work

The glow is diffuse and constant, and it does not penalize the undead creature in combat. The caster can affect one medium-sized body per level, twice as many small-sized bodies, half as many large-sized bodies, or one-fourth as many huge creatures. No creature larger than huge in size can be affected by this spell. The glow does not harm undead creatures in any way. It can be cast on undead that have material form, even if that form is noncorporeal (such as wraiths, but excluding ghosts, which exist primarily on other planes). This spell can be used by necromancers (specialist mages in necromancy) as if it were a necromantic spell for purposes of picking bonus spells from his specialty school.

This spell can be made permanent with a permanency spell for 2,500 gp.